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Securitizations and Variable Interest Entities - Schedule of Assets That Relate to Continuing Involvement with Transferred Financial Assets with Servicing Rights and Maximum Exposure to Loss Including the Unpaid Principal Balance (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
UPB of loans transferred [1] $ 15,147,575 $ 15,600,971
Maximum exposure to loss 15,421,159 15,872,424
Mortgage Servicing Rights - Fair Value [Member]    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Carrying value of assets 123,448 132,774
Advances And Match Funded Advances [Member]    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Carrying value of assets $ 150,136 $ 138,679
[1] Represents UPB of loans we transferred for which we continue to act as servicer or subservicer. Our maximum exposure to loss from transferred loans cannot be estimated because we do not service all of the loans for which we have provided representations and warranties.